The Federal Aviation Administration requires material used to make evacuation systems retain… 1 answer below »


The Federal Aviation Administration requires material used to make evacuation systems retain their strength over the life of the aircraft. In an accelerated life test, the principal material, polymer-coated nylon weave, is aged by exposing it to 158 °F for 168 hours. The tensile strength of the specimens of this material is measured before and after the aging process. The following data (in psi) are recorded:

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(a) Is there evidence to support the claim that the nylon weave tensile strength is the same before and after the aging process? Use the P-value approach.

(b) Find a 99% CI on the mean difference in tensile strength and use it to answer the question from part (a).